/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 *@filename: function/item/now.cc
 */

#include <server_includes.h>
#include CSTDINT_H
#include <function/time/now.h>
#include <session.h>

#include "temporal.h"

String *Item_func_now::val_str(String *)
{
  assert(fixed == 1);
  str_value.set(buff, buff_length, &my_charset_bin);
  return &str_value;
}


void Item_func_now::fix_length_and_dec()
{
  decimals= DATETIME_DEC;
  collation.set(&my_charset_bin);

  bzero(&ltime,sizeof(COLLAPSAR_TIME));

  ltime.time_type=COLLAPSAR_TIMESTAMP_DATETIME;

  store_now_in_TIME(&ltime);
  value= (int64_t) TIME_to_uint64_t_datetime(&ltime);

  buff_length= (uint) my_datetime_to_str(&ltime, buff);
  max_length= buff_length;
}

/**
    Converts current time in time_t to COLLAPSAR_TIME represenatation for local
    time zone. Defines time zone (local) used for whole NOW function.
*/
void Item_func_now_local::store_now_in_TIME(COLLAPSAR_TIME *now_time)
{
  Session *session= current_session;
  time_t tmp= session->query_start();

  (void) cached_temporal.from_time_t(tmp);

  now_time->year= cached_temporal.years();
  now_time->month= cached_temporal.months();
  now_time->day= cached_temporal.days();
  now_time->hour= cached_temporal.hours();
  now_time->minute= cached_temporal.minutes();
  now_time->second= cached_temporal.seconds();
}


/**
    Converts current time in time_t to COLLAPSAR_TIME represenatation for UTC
    time zone. Defines time zone (UTC) used for whole UTC_TIMESTAMP function.
*/
void Item_func_now_utc::store_now_in_TIME(COLLAPSAR_TIME *now_time)
{
  Session *session= current_session;
  time_t tmp= session->query_start();

  (void) cached_temporal.from_time_t(tmp);

  now_time->year   =   cached_temporal.years();
  now_time->month  =   cached_temporal.months();
  now_time->day    =   cached_temporal.days();
  now_time->hour   =   cached_temporal.hours();
  now_time->minute =   cached_temporal.minutes();
  now_time->second =   cached_temporal.seconds();
}

bool Item_func_now::get_temporal(collapsar::DateTime &to)
{
  to= cached_temporal;
  return true;
}

bool Item_func_now::get_date(COLLAPSAR_TIME *res,
                             uint32_t )
{
  *res= ltime;
  return 0;
}


int Item_func_now::save_in_field(Field *to, bool )
{
  to->set_notnull();
  return to->store_time(&ltime,COLLAPSAR_TIMESTAMP_DATETIME);
}

